한국전기전자재료학회논문지 (Journal of the Korean Institute of Electrical and Electronic Material Engineers)

  • 제24권2호
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  • Pages.95-101
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  • 2011
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  • 1226-7945(pISSN)
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  • 2288-3258(eISSN)
한국전기전자재료학회 (The Korean Institute of Electrical and Electronic Material Engineers)
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K-사용자 X 네트워크에서 다중안테나를 이용한 완전 간섭정렬기법

Perfect Interference Alignment for K-user MIMO X Network

  • 박성호 (고려대학교 통신시스템기술협동과정 통신시스템연구실) ;
  • 박기홍 (고려대학교 전기전자공학과) ;
  • 김명진 (고려대학교 전기전자공학과) ;
  • 고영채 (고려대학교 전기전자공학과)
  • Park, Seong-Ho (Telecommunication System Technology, Korea University) ;
  • Park, Ki-Hong (Department of Electrical Engineering, Korea University) ;
  • Kim, Myeong-Jin (Department of Electrical Engineering, Korea University) ;
  • Ko, Young-Chai (Department of Electrical Engineering, Korea University)
  • 투고 : 2010.12.16
  • 심사 : 2011.01.14
  • 발행 : 2011.02.01
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초록

In wireless X networks where all transmitters send the independent messages to all receivers, the theoretical bound on the degrees of freedom (DOF) and interference alignment (IA) scheme for its achievability are given by Cadambe and Jafar [1]. However, IA scheme for wireless X network may be infeasible in practice unless the transmitters have the perfect channel information. In addition, if the transmitter with single antenna uses time-varying channel coefficients as a beamforming vector, the infinite channel extension is required to achieve the theoretical bound on the DOF of wireless X networks with perfect IA scheme. In this paper, we consider K-user MIMO X network where K transmitters and K receivers have M antennas each. While the beamforming vectors have been constructed with multiple channel uses over multiple time slot in the earlier work, we consider the beamforming vectors constructed only by a spatial signature over unit time. Accordingly the channel information at the transmitters can be available instantaneously. Then we propose the perfect IA scheme with no channel extension. Based on our sum-rate analysis and the simulation results, we confirm that our proposed scheme can achieve MK/2 DOF which is quite close to the theoretical bound on the DOF region of wireless X networks.

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참고문헌

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